Electric horn



Aug. 31, 1954 P. NIELSEN ELECTRIC HORN Filed Aug. 1, 1952 INVENTOR. Peter Nlelsen Patented Aug. 31, 1954 ELECTRIC HORN 'Peter Nielsen, Omaha, Nebr., assignor to Jubilee Manufacturing Company, Omaha, Nebr., a corporation of Nebraska Application August 1, 1952, Serial No. 302,197

1 Claim.

This invention relates to improvements in electric vibratory horns.

The primary object of this invention is the provision of an electrical horn having an improved assemblage of parts by means of which the horn may be economically and durably constructed.

A further object of this invention is the provision of an improved housing construction for electric horns of the diaphragm type, by means of which the parts may be efficiently and economically mounted.

A further object of this invention is the provision of an improved adjustable air gap construction for diaphragm type electrical horns with cooperative adjustable circuit maker and breaker means.

A further object of this invention is the provision of an improved circuit maker and breaker assemblage for diaphragm type electrical horns.

Other objects and advantages of this invention will be apparent during the course of the following detailed description.

In the accompanying drawing, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views:

Fig. 1 is a top plan view of a cup shaped base plate structure for the horn housing, showing the horn parts assembled therein.

Fig. 2 is a transverse cross sectional view taken diametrically through the horn structure, showing the associated relation of the circuit maker and breaker sub-assembly and other details.

Fig. 3 is a perspective view of the contact maker and breaker assemblage.

Fig. 4 is a wiring diagram of the horn and circuit in which the same is positioned for operation.

In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of the invention, the letter A may generally designate the improved horn. It may include a casing or housing structure B wherein is located an electromagnetic structure C, a diaphragm and armature assembly D, and a circuit making and breaking assembly E.

The housing construction B preferably consists of a cup shaped base plate In, preferably of stamped metal, and of single piece construction. A face plate I l is provided and may be riveted to the base plate Ill in the usual manner.

It is one of the objects of this invention to provide an economically and durably fabricated electric horn. To that end the base plate includes a bottom well consisting of a wall l4 and annular side walls I5 defining the well chamber I 3. The wall l4 centrally is provided with an inturned annular flange I5, internally screw threaded at l6, to detachably receive an adjustable core of the electromagnetic structure C, as will be subsequently described. At its upper margin, the wall i5 is provided with an outturned right-angled flange which at its outer periphery is annularly upturned at 2|. The upturning flange H has an upwardly and outwardly sloping supporting flange 22. At its outer margin the flange 22 has an upturned vertically disposed annular wall 23 which at its top is provided with a horizontally-disposed outwardly extending face plate attaching flange 23. The face plate ll is of inverted cup shaped construction and is centrally provided with an internally screw threaded opening 25, to which a trumpet may be attached, if so desired.

It should be noted that all of the wells, flanges and Walls of the base plate Ill are integral, and that the base plate is preferably stamped of a single piece of metal.

The electromagnetic structure C preferably comprises a field coil 3i), resting upon the bottom wall M of the housing, within the well compartment !3. It has a passageway 3| into which the centering flange it? extends. A steel bridge reinforcing piece is provided for protecting and holding the coil 38 in position. It includes attaching flanges 3b, riveted at 31 to the horizontal wall or flange 28 of the housing base plate l0. Centrally the bridge piece 35 is provided with upwardly extending segmental walls 38 and the top wall 39. The latter is apertured at 40 to freely receive the armature of the diaphragm assemblage D therein.

The coil core #5 is of cylindrical shape and externally screw threaded at 46 for adjustable entrance into the screw threaded opening N5 of the casing of the housing flange l5. An adjustable core lock nut Lil is screw threaded upon the core in order to hold it in the proper air gap providing relation with respect to the armature.

The diaphragm-armature structure D preferably comprises a flexible steel diaphragm disc 50, suitably connected between the base plate and the face plate by the same rivets which attach said plates together; diaphragm gaskets 5| being interposed between the outer peripheral portions of said plates and the outer peripheral portion of the diaphragm disc, as in conventional practice. Centrally, the diaphragm disc 50 is provided with an armature 55. It consists of a reduced vertically positioned attaching shank 56, extending through a central opening in the diaphragm disc 50. Above the disc 59 there may be provided supporting washers 5? held in position by peening over the shank 56 or providing a nut 58 thereon. Spacing washers 55B are provided upon the shank 56 below the diaphragm. A tripping plate Eli has an opening to receive the armature shank 56. It rests upon the top of the armature body, as shown in Fig. 2.

Referring to the circuit maker and breaker assemblage E, the same is fabricated as a subassembly. Generally, the same is all machine work, and therefore it is preassernbled prior to its attachment in the housing base plate it. It preferably includes a segmental shaped mounting piece 16, of rather stifi' cold rolled strip steel, the ends of which are apertured at ll to receive rivets for attachment to the base plate it, as will be subsequently mentioned. At a concaved edge E2 the piece it is provided with an adjusting screw engaging tongue 73, extending radially oi the segment body of the strip iii, and in the same plane therewith.

The assembly E preferably includes an upper contact support 15, of the same material as the strip Hi. It includes an attaching flange it, an upwardly sloping intermediate portion ll, and a contact supporting body 78. Upon the latter is positioned a pair of contacts 19 depending from the underside of the body piece it. This contact support 75 is riveted at 8% to the mounting strip i0. Directly under the upper contact support is an insulation strip ti and there beneath a lower contact supporting spring or strip 82. The latter is very resilient and supports a pair of contacts 85 complementary to the contacts 79 above described. Insulation strips 37 are disposed beneath the steel strip 82, to insulate the same from the strip it. All of these parts are clamped in place by the rivets 86.

As before mentioned, the entire circuit maker and breaker assemblage E is prefabricated. Itis then secured upon and within the base plate It by means of rivets 38, which secure it upon the sloping wall 22 of the base plate. Thus, the tongue 13 will have a normal inclination downwardly, sloping the same as the wall 22. An adjusting screw 92 is threaded at 93 within the wall 243 of the base plate; a lock nut 95 being provided upon the screw 92 in order to hold its adjustment. The screw .32 bears against the tongue 73 to vary the spaced position of the insulation strip 8i with respect to the trip plate (ill. The moimting plate ill is not easily flexed, since it is not of clock spring steel and it has a very strong down pressure upon the screw 92 when the parts are in the position shown in Fig. 2. Preferably there is only a very slight tendency of the strip Hi to iiex under the adjusting force of the screw 92.

The lower contact strip 32 is preferably provided with a laterally extending terminal iiiii to which one end of the resister coil i8! is connected.

Referring to the wiring diagram in Fig. 4, the numerals above designated have been applied to like parts in the diagram. A battery It? is provided, and the usual horn button I03. Also, a relay Hill is actuated upon closing the button N13 to close a switch H15 and direct the current through the horn coil 38. It is to be noted that both the core 45 and the armature 55 project into the coil passageway 31.

It is to be noted that the air gap H9 may be varied, to adjust the horn tone. Also in cooperation therewith the gap between the trip plate so and the breaker assembly strip 8! may be adjusted.

The battery terminal assembly H5 is preferably connected upon the sloping wall 22, as shown inFig. 2.

Various changes in the shape, size and arrangement of parts may be made to the form of invention herein shown and described, without departing from the spirit of the invention or scope of the claim.

I claim:

In an electric horn construction the combination of a housing structure including a cup shaped base plate and a face plate, said cup shaped base plate inclu ing a central chamber providing portion having an upturned internally screw threaded annular flange extending into the chamber of said well, an electromagnetic coil mounted within said chamber of said well having a passageway which receives the upturned flange of said well therein, a core piece adjustably threaded in said screw threaded flange, lock nut means upon said core for engagement with the base plate to hold the core in adjusted relation within the passageway of said core, said base plate having an outwardly extending horizontal flange at the top of said central chamber providing portion and therefrom having an outwardly extending upwardly sloping wall portion, a face plate, means to connect the face plate with said base plate, an armature and vibrating diaphragm assemblage mounted between said base plate and faceplate including armature'and a trip plate, said armature being disposed in air gap providing relation with respect to said'core and extending into the passageway of said coil,

a bridge plate mounted upon the said outwardly horizontal flange of the base plate'having 'an intermediate opening through which the armature movably projects, a unitary contact maker and breaker assemblage including a mounting plate secured within the cup shaped base plate and upon the sloping wall thereof and includ ing a resilient contact arm positioned to beengaged by the trip plate upon vibraion oi the diaphragm, said mounting plate having a tongue extending towards the center of the base plate, and an adjustable screw mounted upon said horizontal flange oi the base plate for engagement with said tongue whereby to vary the position of the contact arm of the breaker assemblage with respect to the trip plate.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,074,875 Von Voightlander Mar. 23, 1937 2,094,772 Critchfield Oct. 5, 1937 2,135,328 Critchfield Nov. 1, 1938' 2,213,493 Gilinson Sept. 3, 1940 2,299,671 White Oct. 20, 1942 

